I first looked at Zac Gallen’s Stuff metrics after his first two games of the season and noticed that they were way off the numbers he posted in past years. I did expect his numbers to rebound closer to his career averages as the season progressed (and according to the poll in that first article 50% of you thought so, too), but there is fairly strong evidence to suggest that there was no way his grades would get back to the same neighborhood as his 2022/23 levels.
Stuff+ and BotStf claims to only require about 80 pitches to stabilize.